Merge "Adding additional docs for OemNetworkPreferences" am: f13bcb0899 am: f2c389c4c5

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1606593

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I0a4cff353357a270f126a74d2648de755c64a6ee